/// <summary>
///同步父子节点勾选状态
///说明
///在AfterCheckNode事件中使用代码
///eg:e.Node.SyncNodeCheckState(e.Node.CheckState);
/// </summary>
/// <param name="node">需要同步的节点</param>
/// <param name="check">节点当前勾选状态</param>
public static void SyncNodeCheckState(this TreeListNode node, CheckState check) { SyncNodeCheckState_Child(node, check); SyncNodeCheckState_Parent(node, check); }

private static void SyncNodeCheckState_Child(TreeListNode node, CheckState check)
{
  if (node != null)
  {
 node.DownRecursiveNode(n => n.CheckState = check);
  }
}
private static void SyncNodeCheckState_Parent(TreeListNode node, CheckState check)
{
  if (node.ParentNode != null)
  {
 bool _cked = false;
 CheckState _ckState;
 foreach (TreeListNode cn in node.ParentNode.Nodes)
 {
   _ckState = cn.CheckState;
   if (check != _ckState)
   {
 _cked = !_cked;
 break;
   }
 }
 node.ParentNode.CheckState = _cked ? CheckState.Indeterminate : check;
 SyncNodeCheckState_Parent(node.ParentNode, check);
  }
}
/// <summary>
/// 向下递归TreeListNode节点
/// </summary>
/// <param name="node">需要向下递归的节点</param>
/// <param name="conditionHanlder">委托</param>
public static void DownRecursiveNode(this TreeListNode node, Action<TreeListNode> conditionHanlder)
{
  foreach (TreeListNode _childNode in node.Nodes)
  {
 conditionHanlder(_childNode);
 DownRecursiveNode(_childNode, conditionHanlder);
  }
}